I took it a few years ago. Take all the material they recommend/allow( Code book, uglys, fast finder, when I took it ). There was a fairly involved calculation. Don't remember the details. The interesting part is after going to the fire marshals office to get something, I asked to see my results and they wouldn't shown them to me. They would let you look only if you failed. don't forget the business part of the test. I wasn't informed it was two parts to get my state contractors license. I had to make another trip to WV to take that one. They did offer a study book for that one.
It could be all different now. Best of luck